The best part about this highlighter is the thin tip. Unlike other double-sided
highlighters, the Tombow Kay Coat's thin tip is very durable. Usually, you have
to be careful when using such fragile tips-- it's very easy to squash them and
consequently ruin the little nib. However, this highlighter's thin tip resists
squashing, making it very reliable.

I tested this with the Uni-ball Propus Window. Compared to the solid Tombow, the
Uni-ball's tip was weaker, and was squished slightly to one side, changing its
width.

The broad tip isn't as handy. It's hard to make a consistent line with them. You
have to place the flat edge against the paper at just the right degree to get
the full line. It's not easy to use.

The color is a very appealing purple, but it's too dark for me. While some may
consider this boldness a positive trait, the dark color makes it hard to read
highlighted text written in dark ink.

This has to be the best highlighter I've ever purchased. Not only are both tips
high quality, they don't cause bleeding (even on cheap or standard quality
paperback paper). Unlike, most highlighters, this one does not cause smearing on
documents printed with an inkjet printer. Definitely 5 stars!